Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 81 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 546 + 229 = 775. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 860 + 580 = 1440. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 238 + 732 = 970. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 97 × 86 = 8345. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 88 × 41 = 3608. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 60 × 67 = 4026. Correct or wrong? (a) correct (b) wrong
7. 7.Check with nines: 15 × 69 = 1035. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 740 + 329 = 1069. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 27 × 88 = 2376. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 362 + 364 = 726. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 57 × 47 = 2673. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 84 × 55 = 4619. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 660 + 539 = 1191. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 74 × 14 = 1036. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 669 + 751 = 1420. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 53 × 91 = 4823. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 584 + 505 = 1090. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 215 + 908 = 1123. Correct or wrong? (a) correct (b) wrong
19. 19.Check with nines: 798 + 919 = 1717. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 696 + 914 = 1610. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 749 + 152 = 901. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 685 + 180 = 872. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 87 × 15 = 1306. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 478 + 456 = 940. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 74 × 26 = 1924. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 894 + 193 = 1085. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 164 + 917 = 1081. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 879 + 919 = 1798. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 436 + 338 = 782. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 22 × 19 = 417. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 820 + 528 = 1348. Correct or wrong? (a) correct (b) wrong
32. 32.Check with nines: 50 × 66 = 3300. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 951 + 479 = 1430. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 214 + 627 = 841. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 767 + 313 = 1080. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 19 × 78 = 1482. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 30 × 78 = 2340. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 281 + 332 = 606. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 92 × 20 = 1838. Correct or wrong? (a) correct (b) wrong
40. 40.Check with nines: 82 × 22 = 1804. Correct or wrong? (a) wrong (b) correct

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